Heat regulating device



W 20, R9311. w, E WORTH HEAT REGULATING' DEVliCE Filed Sept. 10, 1927 a)Invent; or WILL/AM E. WORTH By 162 441 V/lkme A at; ornegs Patented Oct.20, 1931 UNITED STATES RATET OFFICE WILLIAM ELLISON WORTH, OF NORTHPELBZAIMI, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO MINNEAPOLIS-HONEYWELL REGULATOR COMPANY, OF MINNE- APOLIS, MINNESOTA,A CORPORATION OF DELAWARE nm'r aneunarme nnvrcn,

Application filed September 10, 1921. Serial No. 218,836.

This invention relates to means for regulating heating systems in amanner to permit at least two thermostatically responsive devices, whichare submitted to different degrees of temperature or have difie nt lags,

to cooperate for controlling heat supply to a heating device or devices,so that either or all of the devices can assume control of themechanism.

Objects of the invention are to provide meansoperable independently ofa. master or room thermostat of a heating s stem to separately, andunder certain con 'tions, dominantly, control, heat control mechanism insuch a manner that the heat at a point of delivery in the room can bediscontinued at' the end of any preferred and predetermined timeinterval or intervals conformably to temperature variations of anymagnitude or duration; to provide devices automatically operable as theresult of temperature fluctuations at diiferent places to alternatelysupand interrupt the supply of heat, to the device or devices to whichthe heat is delivered from a heating plant; to provide means for timingthe interval between the opening and closing of a control valve so thatthe heater is not allowed to cool over too long a period,or under otherconditions, is not allowed to receive heat over too long a period; andadditionally to provide means accomplishing the above results in such amanner that either two or more devices can operate to interrupt the heatsupply, but permitting the heat supply to be resumed or con-- tinuedonly when both devices have reached V a predetermined temperature.

have different lags; along with all the details of construction,including combinations and sub-combinations of the elements.

Features and advantages of the invention will be also set forth in thedescription of the drawing forming a part of this application,

, A and -said drawing illustrates one application of the invention. Theparts show a condition in which the heat supply to the radiator isinterrupted.

The present device, illustrative of one application of the invention,comprises a mo-' tor 1 and meshing gears 2 respectively carried by ashaft 3 and the motor shaft. A lever 4; is attached. to the shaft 3 andis connected by a flexibleelement 5 with a weighted valve lever 6,controlling valve 7 in turn controlling heat supply through the pipe 8to a heater 9.

A relay is employed. The numeral 15 indicates its coil, and the numeral16 its armamm. This armature acts as .a switch'closing against acontact, 17. Thisrelay or relayswitch controls current to the motor 1.One ofthe motor lines is indicated, at 18' and the other at 19, thislatter line being connected with contact 17. The opposite side 20 of theline 19 is connected at the opposite side of the switch 16. The branchlines 21 and 22 connect with-the primary of the transformer 23. A cam orequivalent device 25 carried by the shaft 3 has depressions 26-27 topermit aii'tomatic opening of the switch 16 after de-energization of thecoil 15. The cam also provides peripheral portions 28-29 1 ing betweenthe depressions 2627 and these peripheral portions act to mechanicallyhold the switch 16 for certain periods sub stantially correspondingrespectively to the opened and closed positions of the valve 7. It willbe understood, that in this instance, the switch 16 is permitted'to openboth'when the valve;is fully closed, and when fully opened.

. 'Adjacent the radiator is a thermostatic device comprising a thermalelement R carrying insulated contact members respectively designated'Rand R these contacts being respectively alternately' engageable withcorresponding contacts B and W.

It is assumed for illustrative purposes, that this device is placed onefoot above the radiator, the radiator will be at 212 when under fullsteam or heat supply. It is also assumed, for example, that the devicewill reach a temperatufe of 126 and close .on the "hot; side, when theradiator is at2129. It isalso assumed that the contact points ofconductor 30 to element 1.

the thermostatic device are set for a lag, for example, of 26. Thisarrangement will allow the radiator to cool to 100 before a call forheat is made, or before contacts R and B engage. It is to be understoodthat any desired lag can be obtained by properly spacing the contact BWrespectively relative to contacts RR', or by increasing or decreasingthe distance between the heater and the control device.

A room or master thermostat or other similar device suitably placed, hasthe thermostatic element 1' operating between contacts bw. We willassume this instrument set for operation between temperatures of 70 and72, and, therefore, to have a lag of 2. Conductor 30 connects the coil15 with the thermostatic element 7*, and a branch conductor 32 connectsconductor 30 with the element R of the radiator or heater device.Conductor 31 connects contact element R with the contact element F), ofthe master or room device. Switch elements 3334 are arranged to beelectrically connected by projection 43 of the cam 42 of the shaft 3.Elements 35-36 are arranged to be electrically connected by projectionof cam 44 of shaft 3. The controlling portions of these cams occupy, inthis instance, a diametric relation, corresponding to a similar relationof the depressions 26-27 of cam 25. The arrangement is such that whenone cam is closing its circuit the other is farthest from circuitcontact B. Element 36 is connected by con ductor with conductor 40. Theopposite end of the coil 15 is connected by conductor 41 with theopposite side of the secondary transformer.

Operation Suppose the temperature of the radiator device to have fallento 100, and that contact has been made between R and B. This conditionsthe relay circuit for energization of the relay coil 15 to close themain switch and start the motor, as soon as the room or masterthermostat has cooled suificiently to cause 7'b to make contact. Thismakin will, we have assumed, take place at lilntil this contact doestake place, however, no energization of relay can be had. That this istrue is seen by tracing a circuit from one side of the transformerthrough conductor 41, coil 15,

If r is not contacting with b, then current cannot pass throughconductor 31 to element R, and thence by way of element B, conductor 39,switch elements 35-36, conductor 50, conductor 40 to the opposite sideof the transformer. Thus it will be evident that both thermostaticdevices must call for heat or be sufficiently cold, before the motor canbe operated to open the valve and supplyheat. However, when r and 6 domake, the coil 15 is energized, the shaft 3 is caused to rotate and thevalve begins to open and, in this instance, is completely opened afterthe shaft has traveled through an arc of 180. During the first fewdegrees of movement of the shaft, contact between switch elements 35-36is broken, and" current to coil 15, interrupted. The element 16,h0wever, is mechanically held closed by one of the surfaces 28 or 29. Ifthe device starts from its position shown in the drawing the surface 28will act to mechanically hold the element 16 after it is magneticallyraised to circuit closing position. Near the end of the rotative cycleof the shaft, the element 43 electrically connects elements 33-34, thusconditioning the relay circuit to be closed, when contact at eitherthermostatic device is made, as a result of suflicient heating.

The device is now conditioned for operation to close the steam valve assoon as the temperature rises sufliciently. This can be accomplished, aswill be seen by the thermostatic control device acting eitherindependently or in unison. That thermostatic device which first heatssufficiently will assume control to close the valve. Suppose the temperature of the radiator device, to raise to 126. The result will bethat element RlV will make contact, resulting in the energization of therelay, and subsequent valve closure. Here it will be seen that theradiator thermostat assumed control to close the valve. However,although the radiator device has operated to shut off the supply ofheat, the temperature at the master thermostat may not have risen to itsmaximum of 72. The radiator will, therefore, begin to cool, while theelement 1" of the room or master tl1e1-niostat is in contact with Z).When the radiator has cooled sufliciently, contact will be made betweenR and B and the valve will again be opened. This opening and closing ofthe valve as the result of operation of the ra diator device willgradually build up the temperature until contact between 9 and Z) isbroken, and then regardless of the temperature at the radiator, themaster or room thermostat may assume control and shut off the supply ofheat. That this is true can be seen by tracing the circuit as follows:transformer, conductor 41, coil 15, conductor 30, element 7', contact w,conductors 38-37, switch elements 3334, conductor 40 to the oppositeside of the transformer.

It will he therefore noted that the heat supply can be interrupted asthe result of the operation of either. of the thermostatic devices, andeach can operate independently of the other to obtain this result. Theresult is that heat is intermittently supplied to the radiator as theresult of operationof the radiator thermostat, until a sufficient amountof heat has been, supplied tocause the roomor master thermostat toassume control to shut oii the supply of heat, regardless of thetemperature at the radiator. However, in order that the valve may beopened as the result of a call for heat at the room thermostat, theradiator thermostat must necessarily be closed or be making at RB. Asbefore stated,in this case the steam valve is caused to open, heatbuilds up at the radiator and eventually contact is broken at R-B andmade at R'--W, which latter contact will cause a second operation of themotor to close the valve. The relay is alternately energized, firstly,only when both of the thermostatic devices are sufficientlycold,secondly, when either thermostatic device is suficiently hot. The firstener ization results in o ening ol' the steam va ve and a supply 0 heatto the radiator, while the secondenergization results in closing of thevalve and the discontinuance of the supply of heat to the radiator.

The mainswitch cam 25, operates to hold the switch mechanically closedafter de-energiza tion of the relay, and afterwards to release theswitch for' automatic opening, after a predetermined period in thisinstance, whenever the valve is fully opened or fully closed. The othercams act to alternately open and close their circuits to the relay andthermostatic devices, so that one cam closes its circult to condition itto permit cner iza- .tion of the relay on a call for heat, and. theother closes to condition the circuit for energization oi the relay upona call for less heat. The arrangement cit these cams in relation to themain switch control cam is such that whenever this main switch cam ispositioned .to permit automatic opening ot the main switch, either oneor the other cam is closing its circuit or conditioning its circuit forthe purposes'above mentioned.

The numeral indicates an enclosure in which the radiator, as a point oidelivery of l the heat, is located along with the two thermostaticdevices which are exposed in different degrees to the'heating efiects ofthe radiator. The numeralbl indicates a source of heat supply such usefurnace and the numeral 52 an enclosure such as acellar containing thisheating plant or source.

ll claim as my invention: 1. A system including a furnace, a radiator,pipe connections for delivering heat from w the furnace to the radiator,a valve for controlling heat supply through the pipe, a plurality ofthermostatic devices placed at diderent distances from the radiator andboth adapted to be adected by heat delivered by said radiator, and meansfor controlling said valve by said thermostatic devices to con- J trolradiator temperature independently of the temperature of the source ofheat supply, so that both thermostatic devices must be sufficiently coldto close in order to open the valve and so that when either thermostaticdevice is sufliciently hot the valve is closed and so that thatthermostatic device nearest the radiator can obtain opening and closingof the valve when the other thermostatic device is sufiiciently cold toclose.

2. A system including a furnace, a radiator, pipe connections fordelivering heat from the furnace to the radiator, a valve for controlling the supply through the pipe connection, a plurality ofthermostatic devices one of which is placed adjacent the radiator, andanother more remote therefrom but both ada ted to be afiected by heatdelivered by sai radiator, and electrical and mechanical means forcontrolling said valve, including circuits which are controlled by saidthermostatic devices, so that the thermostatic device nearest the radiator can obtain opening and closing of the valve when the otherthermostatic device is sufiiciently cold to close, and so that boththermostatic devices must be suficiently cold to close in order to openthe valve, and so that when either thermostatic device. is suflicientlyhot the valve is closed.

3. In vcombination, an enclsoure having a.

furnace therein, a second enclosure, having a radiator therein, pipingconnecting-the inrnace with the radiator, a valve in t means forcontrolling thevalve including a thermostatic switch disposed adjacentthe radiator, a second thermostatic switch in the same enclosure withthe radiator but more remote therefrom and mechanical and electricalmeans for controlling the valve, including electrical. circuits betweenthe thermo" stats and mechanical means such that the thermostat nearestthe radiator can alternately obtain anopenin and closing of the. valvewhile the other t ermostatic device is sufficiently cold to close, andsuch that both thermostatic devices must, be suficiently cold to closein order to open the valve and such that when either is suficiently hotthe valve is closed,

d. A device of the class described comprising a space to be heated, asource of heat supply external to the space to be heated, two

thermostats directly responsive to the changes in temperature of the airin the space to be heated, heat radiating means supplied by the heatsource and so placed as to afiect one of said thermostats more than theother, and means'adapting said thermostats to control said heat sourceto obtain production of heat when both thermostats are suflicientlycold, and to prevent further production of heat when either thermostatsis suiliciently hot.

5.. A space to be heated, a steamheating system having a heat generatingdevice which llllt is external to the space to be heated, twothermostats directly responsive to the changes in temperature of the airin the space to be heated, heat radiating means supplied b the generatorand so placed as to aflect one 0 said thermostats more than the other,and means adapting said thermostats to control said heat source toobtain production of heat only when both thermostats are sufficientlycold and to prevent further. production of heat when either thermostatis sufliciently hot.

In witness whereof, I have hereunto hand this 31 day of Aug, 1927.

WILLIAM ELLISON WORTH.

set my

